Mixer for paving materials



May 14, 1929. Fl E. GREENE MIXERv FOR PAVING MATERIALS Filed July 21, 1924 2 Sheets-Sheet l Fred E. Greene. l l

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May 14, l929\ F. E. GREENE MIXER -FOR PAVING MATERIALS 2 Sheets-Sheet 2 Patented May v14, 1929.

UNITED STATES PATENT OFFICE.

EEEE E. GREENE, or BERKELEY, CALIFORNIA, AssIGNoE To EEssIEn. GREENE, E

' BERKELEY, CALIFORNIA. Y

MIXER Eon PAVING MATERIALS.

Application filed July 21, 1924. SerialNo. 727,161.

This invention relates to mixers for use in mixing variousYV ingredients of asphalt pavings and the like.

The object' of the invention is to provide ya mixer which will insure a proper'and thorough agitation and commingling of the various ingredients in as short a time as possible. a proper heating or cooking of the materials while they are being ymixed together. It is also an object of the invention to provide a mixer' which can be utilized in connection with a portable paving plant, and wherein the mixed materials will be automatically dis-- charged from the mixer and delivered to the desired location upon the roadway.

These objects I accomplishby providing a drum having a novel arrangement ot vanes on its interior which' are in `the forni of interrupted spirals. These vanes serve to mix theinaterials and move the materials longitudinally of thevdrum, tirst in a ydirection from the feed opening to the discharge opening and thence in an opposite direction, so4

that a. thorough mingling and mixing ot the ingredients is produced. The arrangementof the drum is such that the mixed materials Fig. 1 shows a vertical longitudinal sectional view of a mixer embodying my inven# tion; Y

Fig. 2 shows a sectional view on theline 2-2 ot Fig. 1; j

Fig. 3 shows an end elevation ot the discharge end of the drum;

Fig. 4t shows a side elevation of the discharge end of the drum;

Fig. 5 shows a detail view partly in section, of the gate for closing the discharge opening;

Fig. 6 shows a A further object is to provide tork detail view in section of the spring means incorporatedin the gateoperating mechanism.

lAs herein shown, .the device comprises a drum 10 rotatably mounted upon rollers 1l by means o1' a track 12 at either end of the drum.r The drum has a eedhopper 13 at one end, leading to a central opening inthe head of the drum'. There is a central. discharge opening vin the opposite end of the drum, normally closed by to be described. f y

On the linterior ot the drum I arrange an outer set oi' interrupted spiral vanes 15 and an inner set oit interrupted spiral vanes 16.

There are preferably tour spirals or helixes in each set, arranged at quarter-points. Each helixV or spiral is interrupted,'leaving a successionoif vanes which extend through an arc of approximately ninety degrees, successiveM vanes being spaced approximately ninety degrees apart.

end of the drum, a, 12,0, and Z respectively; the next succeeding vanesadjacent'the'mida gate 14 presently For convenience I have designated the four outer vanes ad]acent the ieed` dle ofthe drum are designated a, b', 0', and

cl', while those near the vdischarge'end of the drum are designated and 0l. It will be seen that vane ais a continuation of the helix represented byi vane ca o is a continuation of the helix on which vane b lies, etc.

The outer series of .vanes have their helixf Winding in one direction, so that material is space of approximately ii'inetyfdegrees vbeiv tween successive tvanes lying `in the same helical path, said successive vanes being designated e, f, g', it', and g and 71.. At each `series of vanes there are but two vanes lying adjacent the discharge end ofty the drum, on

account of thenecessity forthe provision of two scoops 17, which serve to pick up the material and direct it to therdischarge o`pen-V loo ing. These two scoop membersare arranged on opposite sides of the discharge opening and extend from said opening to the periphery oi.r the drum, being concave in form and shaped so as to deliver any material talling thereon to the discharge opening.

The outer series of vanes 15 are secured in any desired manner directly to the interior wall of the drum, and the inner series of vanes are held in place by longitudinally eX- tending bars 18, so that the vanes revolve in unison with the drum.

The gate which controls the discharge opening is rotatably mounted upon an elbow 19, as best shown inlTig. 5, so that said gate when moved into closed position may rotate with the drum. The elbow is formed with a cross-rod 2O at its upper end, and said crossrod is hingedly supported upon standards or framework 21. At one end of the cross-rod is a lcrank Q2, connected to a link 23, the link in turn being connected to a lever 24C, said lever being provided with the usual rack and detent mechanism. Through this lever the gate may be moved into closed position or swung upwardly to allow the materials to be discharged through the opening in the end of the drum. The link 23 is preferably provided with a spring connection 25, shown in detail in F ig. 6, so that yielding pressure may be applied by the lever to close the gate. The advantage of this is to insure proper closure 'of the gate in case small rocks or unyielding objects should become lodged between the gateV andthe rim of the opening. Such rocks or smallobjects will ultimately become dislodged, and thereupon the spring pressure will serve to torce the gate into close engagement with. the end of the drum.

lThe drum is preferably surrounded with a casing 26 having tire-box 27 in its bottom portion and a flue 28 at the top. Any suitable heating means may be introduced in the .tirebox 2i' forheatin g the contents of thedrum.

In practice, the drum is preferably mounted on a carriage shown,v t'or example, in my being rotated in the direction indicated by the arrow in Fig. 2) will serve to force the material slowly towards the discharge end oi the drinn, and at the same time these vanes will vthoroughly mix the ingredients together. 1l.Vhen the materials reach the discharge end of the drum they are piled up against the end wall of the drum, so that the inner series ot venes will act on the materials to stir them and move them slowly in an opposite direction longitudinally ot the drum. rlhe materials upon reaching the feed end of the drum will be piled up so that they are out of the'path of' the spiral vanos, and thereupon they are tree .to move back towards the discharge end oi the drum along the anis thereof. In this connection it should-be borne in mind that the drum is preferably arranged on a slight incline, so that gravity will act to assist inthe final movement of the mixed materials towards the discharge opening. Villien the materials have -thus been mixed and heated a sumcient length of time, the gate 14 is swung open and thereupon the scoops17 lact to direct th e mined materials out through the discharge opening in an obvious manner.

Various changes in the construction and arrangement of the several parts herein shown and described may be employed ,withoutdeparting from the spirit of my invention, as disclosed in the appended claim.

lli/That l claim and desire to secure by Letters Patent is:

A mixer for paving materials and the like, comprising a rotatable drum, a feed hopper at one end thereof, said drum having a discharge opening to med'in its opposite end, a manually controlled gate for maintaining the discharge opening normally closed, a plurality of helically shaped vanes directed'all in one direction and secured on the inner tace of the drum, said vanes being arranged in spaced groups from end to end of the drum and each group containing. a plurality of interrupted va es, secondary groups et helical f V ly shaped vanes all directed in theopposite direction and eachgroup containing a plurality oi interruptedvanes, means securing the secondary vanes Vwith relation to the iirstnamed vanes in a concentric positionfwithin the iirst-named vanes, and a pairofopposed scoop-like members extending from the discharge openingto the kinner face of the drum lfor directing mixed material towards the discharge opening.

FRED GREENE. 

